Yup, you get it, although I plan on epoxying in existing door, and using the 2'+/- wide cut out as first/main door panel.
(That's going to take some thought and structural consideration to support possibly 225 lbs or more and still fold up compact enough to allow torso and shoulder room.)
The top hinge...somehow, don't know yet how, I'll need to place "legs"/supports, actually outside the door, to support the two panels where the hinge is, which would mean I'll only have a 28"+/- span for each panel.
Similar to this:
http://www.clubcobra.com/forums/album.php?albumid=4019
Yup, fun, love a challenge, one step at a time.
Photo shows one more step I took yesterday, 2008 Toy Hauler. Web photo, similar.